Flowserve WK70 Series - Manual

Worcester Controls
CAUTION: Flowserve recommends that this product be stored
indoors prior to installation, in an environment suitable for human
occupancy. Avoid areas where exposure to relative humidity above
85%, acid or alkali fumes, radiation above normal background,
ultraviolet light, or temperatures above 1200°F/below 400°F may
occur. Do not store within 50 feet of any source of ozone.
A. INSTALLATION
1. WK70/WK74 valves may be installed for flow or vacuum in either
direction. Use care to exclude pipe sealants from the valve cavity.
Valves with upstream relief hole in ball (V3 option) are directional
(one-way) valves.
2. Weld End Valves:
Prior to welding or brazing, ENSURE ALL JOINT SURFACES ARE
CLEAN, to prevent contamination. Valves with XBO pipe ends can
be welded in the line without disassembly of the valve.
3. CAUTION:
a. With the exception of valve seats, no fluoropolymer parts are
reusable.
b. Special care should be taken to avoid scratching the
fluoropolymer seals during installation. Light lubrication of
these seals can help to prevent damage.
c. WK70/WK74 valves and repair kits have been assembled,
cleaned, and packaged for ultra-high purity systems. Caution
should be used to maintain the cleanliness of the valve parts.
d. WK70/WK74 valves are factory assembled with NO
lubrication.
B. OPERATION
1. Valve operation consists of turning the handle a quarter-turn
clockwise to close and a quarter-turn counter-clockwise to open.
The valve is open when the handle and/or stem flats are in line
with the pipeline. WK70/WK74 valves may be automated (used
with actuators).
2. These valves will provide bubble-tight shut-off when used in
accordance with Worcester’s published pressure/temperature
chart.
3. It is not good practice to leave a ball valve partly open (throttling
operation) without knowledge of the pressure drop and flow at
that position.
4. Media that can solidify, crystallize or polymerize should not be
allowed to stand inside ball valve cavities.
5. Torque Requirements - Operating torque requirements will vary
depending on the length of time between cycles, line pressure,
type of valve seats, or the media in the piping system. For a
detailed analysis of valve torque requirements, refer to the
Worcester Actuator Sizing Manual.
C. MAINTENANCE
Tighten the retaining nut if leakage is visible in the stem area.
CAUTION: Over-tightening stem nuts results in high operating
torque and shorter stem seal life. Follow proper stem adjustment
procedure below.
For Manual Valves (with two stem nuts):
1. Tighten retaining nut (lower nut) clockwise until Belleville washers
are “bottomed-out” flat.
2. Back off the retaining nut 1 /
6
of a turn.
3. Tighten handle nut securely to lock retaining nut in place.
For Automated Valves (with one self-locking stem nut):
1. Tighten self-locking stem nut until Belleville washers are “bottom-
out” flat.
2. Back off nut 1 /
3
of a turn. NOTE: The self-locking nut requires a
good amount of effort to tighten. Ensure that Belleville washers
are fully compressed flat before backing off.
12630-B
Tube Bore Clean Valves
1 /
2
" – 2" WK70 and 1 /
2
" – 2" WK74
Installation, Operation and Maintenance Instructions